恳请大家看看这个怎么敲

#!/usr/bin/env python
# -*- coding: utf-8 -*-

num = input('输入金额，以￥或$开头加数字：')
if num[0] not in ['$', '￥'] or not num[1:].isdigit():   # 错误判断
    print('Input Error')
else:
    currency = num[0]
    amount = float(num[1:])
    if currency == '￥':
        print('￥%.2f = $%.2f' %(amount, amount/7.0))
    else:
        print('$%.2f = ￥%.2f' %(amount, amount*7.0))

a=input()
t=a[0]
a=float(a[1:])
if t == '$':
    print('￥%.2f' % (a*7.0))
else:
    print('$%.2f' % (a/7.0))

money = input()
type = money[0]
num = int(money[1:])

if (type == '$'):
    print('￥%.2f' % num * 7)
else: 
    print('￥%.2f' % num / 7)